#5FAD34

CSS

:root {
  --grass: #5fad34;
  --grass-rgb: 95 173 52;
  --grass-oklch: oklch(0.673 0.173 136.6);
}

.element {
  color: var(--grass);
  background-color: hsl(99 54% 44%);
  border-color: oklch(0.673 0.173 136.6);
}

Tailwind CSS v4

@theme {
  --color-grass: #5fad34;
  --color-grass-50: #ddffd2;
  --color-grass-100: #cbf6bf;
  --color-grass-200: #afe69e;
  --color-grass-300: #89cc74;
  --color-grass-400: #6bb545;
  --color-grass-500: #479e00;
  --color-grass-600: #3d8603;
  --color-grass-700: #316b06;
  --color-grass-800: #264e00;
  --color-grass-900: #193700;
  --color-grass-950: #092100;
}

SCSS

$grass: #5fad34;
$grass-rgb: 95, 173, 52;
$grass-light: mix(#fff, $grass, 20%);
$grass-dark: mix(#000, $grass, 20%);

.element {
  color: $grass;
  box-shadow: 0 0 0 2px rgba($grass, 0.35);
}